Turbine installation Determination of Critical Speed: When the vibration meter is started at a speed between 3,400 and 3,900 rpm, the amplitude should not exceed 0.15 millimeters. Turbine Installation Vibration Measurement: As the starting speed increases to 5,550 rpm, use a vibration meter to measure the amplitude near the bearings in the vertical, axial, and lateral directions; the amplitude should not exceed 0.03 millimeters. Determination of Emergency Trip Breaker Tripping Speed and Post-Trip High Operating Speed: This technical test study can be conducted by increasing the governor speed after the no-load speed reaches 5,550 rpm. The test should be repeated more than three times, and the tripping speeds recorded; the differences among trials should generally be within 55 rpm. Analysis Test for Overspeed Development: Conduct a 15% overspeed test according to the specified method, lasting five minutes. Determination of Main Valve Closing Time: After the emergency trip breaker trips, use a stopwatch to measure the time required for the main valve to move and completely close. Record the oil pressure at the moment the main steam valve automatically closes. After startup, record various operational parameters every 10 minutes, including bearing temperature (not exceeding 65 degrees Celsius) and outlet oil temperature (not exceeding 60 degrees Celsius). Axial expansion of each cylinder was measured at the rear guide plates of the cylinders. Lateral expansion was measured at the claw coupling where the cylinder connects to the gearbox. After shutdown, record the idle-speed curve every 30 seconds. When the turbine oil pump system starts automatically under control, record the main unit’s rotational speed and oil pressure. Conduct leak tests on the condenser copper tubes and check for water leaks. Perform a 72-hour continuous full-load operation test on the installed turbine.

Turbine installation Speed control system: While the steam turbine is operating under stable load conditions and continuous system operation, record the changes in turbine speed. Increase or decrease the turbine’s operating load to 25% of the rated ambient load and record the resulting operational changes. Then, increase or decrease the turbine’s operating load to 100% of the rated ambient load and record the corresponding changes in turbine speed. When the turbine is idling, use the manual governor to record any changes in speed.

Turbine installation During turbine operation, the static characteristics of the speed control system—namely, the relationship between auxiliary oil pressure and rotational speed, the relationship between piston stroke and oil motor load, the relationship between auxiliary oil pressure and oil motor stroke, and the relationship between speed and load—are crucial. To assess the turbine's ability to rapidly reduce its load from various operating conditions down to no-load status, an analysis method is employed that involves measuring the instantaneous efficiency at high-speed operating points and tracking the changes in rotational speed over time after the turbine has stabilized. (This condition depends on the specific management practices of the power plant; we may need to conduct such tests by suddenly tripping the circuit breaker when the turbine is loaded at 500 kW, 1000 kW, or 1500 kW. It is advisable to use an oscilloscope and high-speed photography to obtain more accurate results.)

Thermal Efficiency Performance and Assurance Testing: A 40% rated-load test conducted without steam extraction and with no steam consumption under no-load conditions. Vacuum Reduction Assurance Testing: By reducing the cooling water flow, the vacuum is lowered to 0.0125 MPa, ensuring that the turbine can still maintain its rated output. Output Assurance Testing by Lowering Steam Parameters: The boiler steam pressure is reduced to 1.1 MPa at 320℃, and the turbine’s ability to maintain its rated output is tested. Post-Shutdown Lid-Opening Information Security Management Inspection: Pay attention to whether any movement occurs in the impeller and blades.